Pierce, John
Good points. I think Chieftain may have tapped into a new market.
John, you're right to suggest that tank crews tend to speak favourably about the tank they know best and yes, there is always a national slant. Here's why the M60 height is a real issue in combat.
This shows T-64B, Chieftain and M-60 A3, contemporaries on the battlefield of the mid eighties.
The issue is how much of a target do you present when scanning for, engaging the enemy and moving. The top line, track up, shows that there isn't much in it, you're fully exposed and speed, agility and low ground pressure govern whether you make the next bit of cover.
The difference comes in the next two. Turret down is a position in which the gunner's and commander's sights can observe for the enemy while most of the tank is protected.
Once you've identified the enemy, you come up into hull down and engage. You can see from the picture how much more M60 has to expose to observe and engage. That determines the likelihood of an emend first detecting you and then being able to hit you.
I cam best illustrate that with a some views of typical engagement ranges between 800-1800M. M-60 is on the right, T-64B on the left. This is crucially where M-60 shows its relative vulnerability. Hitting a turret sized target at above 1500M was difficult in the eighties and M-60 became relatively more vulnerable at longer ranges. Yes, you can offset that a bit with artillery and air but come the crunch when you haven't got them, the tank's own level of protection is crucial. That's why the designers of T-64 and Chieftain tried so hard to reduce the silhouette, whereas for the designers of M-60, it didn't seem to matter much.
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For the IDF this was less of an issue on their southern, more open flank where they deployed M-60 but the Centurions remained on the Golan, where the terrain is much more broken. And finally, the IDF started planning for Merkava at about the time Chieftain was coming into service, around 1970. It was designed with the lessons of the Six Day War in mind. Mauled by infantry anti-tank weapons, the IDF thought tanks should carry infantry to protect them. The resulting tank is big. In the West, the lesson was interpreted differently. Yes, close support of tanks by infantry was needed but by all-arms co-operation, which meant giving the infantry comparable mobility and increased protection to stay with the tanks in a fight. Hence the development of Warrior, Bradley and Nacmachon.
Thanks for your interest Pierce and John.
Stephen